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The expression x[n]y is defined for positive values of x and y and for positive integer values of n as follows:
- x[1]y = xy
- If n is odd, x[n+1]y = (x[n]y)x
- If n is even, x[n+1]y = (x[n]y)y
If y = ½ and x[4]y = 2, then x =
(A) ¼
(B) ½
(C) 1
(D) 2
(E) 4